Finding the Fourth Proportional to 989.72, 1,495.82 and 972.72

Step by Step Solution

1. Step 1: Write the proportion equation
   989.72 : 1,495.82 = 972.72 : x
2. Step 2: Convert to fraction form
   989.72/1,495.82 = 972.72/x
3. Step 3: Cross multiply
   989.72x = 1,495.82 × 972.72
4. Step 4: Simplify right side
   989.72x = 1,455,014.03
5. Step 5: Solve for x
   x = 1,455,014.03/989.72
6. Step 6: Final answer
   x = 1,470.13